<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<form action="ThirdServlet" method="post">
    用户名：<input type="text" name="username"><br>
    密码：<input type="password" name="password"><br>
    爱好：<input type="checkbox" name="hobby" value="A">A
    <input type="checkbox" name="hobby" value="B">B
    <input type="checkbox" name="hobby" value="C">C<br>
    <input type="submit" value="登录"><br>
</form>

</body>
</html>